The molecular formula of 1,2-dichloroethane is C2H4Cl2.
The atomic weights of carbon (C), hydrogen (H), and chlorine (Cl) are approximately 12, 1, and 35.5 respectively.
So, the molecular weight of 1,2-dichloroethane is (2*12) + (4*1) + (2*35.5) = 24 + 4 + 71
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